Over the past five years, the little-known ETF has returned about 23% a year, outpacing the Standard & Poor's 500's 19% during that period. The fund has also handily beaten the S&P 500 over the past two- and one-year periods as well.

"Firms that repurchase shares have tended to outperform, and firms that issue shares have tended to underperform," writes Samuel Lee, a Morningstar analyst who specializes in passive investing. "These effects have been found around the world. Strangely, firms that buy back shares tend to outperform for years after the repurchases are first announced."

Morningstar

Though Morningstar has given the fund a five-star rating, Lee takes a detached view of the ETF, arguing that its "main claim to fame is its heavy quality exposure, which one can obtain elsewhere more cheaply."

Quartz

But, according to Quartz's John McDuling, "it could get worse before it gets better—for reasons that have nothing to do with the company's actual performance."

He points out that the "lockup period" just expired, "which means employees that were awarded shares in the company as a part of their compensation and early investors who are large stock owners will finally be allowed to sell their shares."

The stock fell 17% in Tuesday's trading as some early investors were clearly doing some selling.

Finally, there's been plenty of discussion in recent days of whether housing is a good or bad investment. Into that debate steps Jeff Gundlach, the influential money manager known primarily for his bond expertise.

As Fortune's Stephen Gandel describe Gundlach's presentation, "Homeownership rates have fallen in the past few years, and people assume those numbers will go back to where they were before the housing bust. But Gundlach says the current level of homeownership is normal. It was elevated in the mid-2000s."

But one of Gundlach's most troubling arguments is the notion that the "kids aren't alright."

More young people, Gundlach points out, are staying with their families for longer periods after college, or renting. What's more, rising rents, he says, will make it harder for renters to save money for a down payment.

"Renting has become more appealing to younger people," he told the Sohn audience—which included me—on Monday. Many of these youngsters were shocked by the collapse of housing prices a few years ago "and they think that mortgage rates of 4% or 5% aren't low."

He concludes that homeownership rates are heading to new lows and that housing starts are not going to rebound.